<?php
  
  interface child{
  	function say();//public
	function play();
  }
  class boy implements child {
  	function say(){
  		echo "我叫".$this->name."我是男生";
  	}
	function play(){
		
	}
  }
  class girl implements chid {
  	function say(){
  		
  	}
	function play(){
		
	}
  }
?>